<template>
    <div class="toast-wrapper" :class="toastClasses">
        <div class="toast" ref="toast">
            <div class="message">
                <slot v-if="!enableHtml"></slot>
                <div v-else v-html="$slots.default[0]"></div>
            </div>

            <div class="line" ref="line"></div>

            <span v-if="closeButton" class="close" @click="onClickClose">
            {{closeButton.text}}
        </span>
        </div>
    </div>
</template>

<script>
    export default {
     name: 'GuluToast',
     props:{
         autoClose:{
             type: [Boolean,Number],
             default: 5,
             validator(value) {
                 return value === false || typeof value === 'number';
             }
         },
         closeButton:{
             type:Object,
             default(){
                 return{
                     text: '关闭',
                     callback: undefined
                 }
             }
         },
         enableHtml:{
             type: Boolean,
             default: false
         },
         position:{
             type: String,
             default: 'top',
             validator(value){
                 return ['top','bottom','middle'].indexOf(value) >=0
             }
         }
     },
     mounted(){
         this.updateStyles()
         this.execAutoClose()
     },
     computed:{
         toastClasses(){
             return {[`position-${this.position}`]:true}
         }
     },
     methods:{
         updateStyles(){
             this.$nextTick(()=>{
                 this.$refs.line.style.height = `${this.$refs.toast.getBoundingClientRect().height}px`
             })
         },
         execAutoClose(){
             if(this.autoClose){
                 setTimeout(()=>{
                     this.close()
                 },this.autoClose * 1000)
             }
         },
         close(){
             this.$el.remove()
             this.$emit('close')
             this.$destroy()
         },
         onClickClose(){
             this.close()
             if(this.closeButton && typeof this.closeButton.callback === 'function'){
                 this.closeButton.callback(this)
             }
         }
     }
    }
</script>


<style lang="scss" scoped>
    $font-size: 14px;
    $toast-min-height: 40px;
    $toast-bg: rgba(0,0,0,0.74);

    @keyframes slide-up {
        0% {opacity: 0; transform: translateY(100%);}
        100% {opacity: 1; transform: translateY(0%);}
    }
    @keyframes slide-down {
        0% {opacity: 0; transform: translateY(-100%);}
        100% {opacity: 1; transform: translateY(0%);}
    }
    @keyframes fade-in {
        0% {opacity: 0; }
        100% {opacity: 1; }
    }
    .toast-wrapper{
        position: fixed;
        left: 50%;
        transform: translateX(-50%);
        $animation-duration: 300ms;

        &.position-top{
            top: 0;
            .toast{
                border-top-left-radius: 0;
                border-top-right-radius: 0;
                animation: slide-down $animation-duration;
            }
        }
        &.position-middle{
            top: 50%;
            transform: translateX(-50%), translateY(-50%);
            .toast{
                animation: fade-in $animation-duration;
            }
        }
        &.position-bottom{
            bottom: 0;
            .toast{
                border-bottom-left-radius: 0;
                border-bottom-right-radius: 0;
                animation: slide-up $animation-duration;
            }
        }
    }

    .toast{
        font-size: $font-size; line-height: 1.8; min-height: $toast-min-height; color: #fff; padding: 0 16px;
        display: flex; align-items: center;
        background: $toast-bg;
        border-radius: 4px;
        box-shadow: 0 0 3px 0 rgba(0,0,0,0.50);

        .message{padding: 8px 0;}
        .close {padding-left: 16px;flex-shrink: 0;}
        .line{height: 100%;border-left: 1px solid #fff;margin-left:20px;}
    }
</style>